Let's say that A1:A10 is the region of interest.

Select A1 down to A10 so that A1 is the primary cell.
Then choose Format->Cells->Conditional Formatting
Click Edit Style and pick the Background Color Red, OK
Select as condition "Expression x evaluates to TRUE".
Enter as x: countif(A$1:A$10,A1)>1  and finish with tab
click "Add"
click "close"

Any cells with duplicate value in A1:A10 should now be highlighted in red.

Andreas


On 2018-07-01 06:13 AM, Bruce Hohl via gnumeric-list wrote:
I don't really know if the conditional format feature can do that, but you can use something like countif(A$1:A$10,A1) in another column to determine which cells are duplicates (i.e. count > 1).  Then you could use conditional formatting on the countif() column.

On Sat, Jun 30, 2018 at 5:41 PM, bill <[email protected] <mailto:[email protected]>> wrote:

    Hi all,
    I'm thinking this would fall under conditional formatting, but
    have not been able to find the option i need in the program or
    manual. I need to search a single column containing some 12,000
    rows of text and highlight any duplicates without removing
    anything. Any help much appreciated!
    peace
    bill

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